Hello,
A friend and fellow audio nut acquired a Ming Da model ???.
It has (2) 12ax7, (2) 12au7, and a rectifier tube. This one had $900 of mods by Response Audio. It's loaded with Vcaps.....and is heavily modded. This preamp was up for bid on Agon a few months back and no one bid on it until my friend put in a min bid of $500. We recently had a mini preamp shoot out with a Moscode Minuet, N.E.W (Cary) P3. He then did an extended compare to my VTL 2.5 at his home. The modded Ming Da clearly held it's own and in my humble was the best of the bunch. I only wish I owned it. I doubt many of these come up often being a modded version but if you can get one you'd be well off.
I've read the Doge 8 preamp is also very nice. These do not come up often here on Agon. For around $800 a TAD 150 Signature is also nice. I previously owned one and it was close to the VTL 2.5 in many respects. The TAD has components from China but final assembly is here in USA.
Finally, also read the Jolida Envoy is suppose to be good. Never herd one though.
Best of luck